Buggy code:
public class TinyPredicate { private final TinyPredicate . Operator operator ; protected PredicateType predicateType = PredicateType . SIMPLE ; protected List < TinyPredicate > predicateList = new ArrayList < > ( ) ; protected String column ; protected List < Object > values = new ArrayList < > ( ) ; protected boolean isValid = true ; protected boolean empty = false ; protected TinyPredicate ( PredicateType type ) { } protected TinyPredicate ( String alias , String column , TinyPredicate . Operator operator , List values ) { } private static TinyPredicate createPredicate ( PredicateType type ) { } public TinyPredicate and ( TinyPredicate other ) { } public TinyPredicate or ( TinyPredicate other ) { } public TinyPredicate negate ( ) { } public static TinyPredicate isNull ( String column ) { } public static TinyPredicate isNull ( String alias , String column ) { } public static TinyPredicate isNotNull ( String column ) { } public static TinyPredicate isNotNull ( String alias , String column ) { } public static TinyPredicate equal ( String column , Object value ) { } public static TinyPredicate equal ( String alias , String column , Object value ) { } public static TinyPredicate notEqual ( String column , Object value ) { } public static TinyPredicate notEqual ( String alias , String column , Object value ) { } public static TinyPredicate lessThan ( String column , Object value ) { } public static TinyPredicate lessThan ( String alias , String column , Object value ) { } public static TinyPredicate lessThanOrEqual ( String column , Object value ) { } public static TinyPredicate lessThanOrEqual ( String alias , String column , Object value ) { } public static TinyPredicate greaterThan ( String column , Object value ) { } public static TinyPredicate greaterThan ( String alias , String column , Object value ) { } public static TinyPredicate greaterThanOrEqual ( String column , Object value ) { } public static TinyPredicate greaterThanOrEqual ( String alias , String column , Object value ) { } public static TinyPredicate like ( String column , Object value ) { } public static TinyPredicate like ( String alias , String column , Object value ) { } public static TinyPredicate between ( String column , Object startValue , Object endValue ) { } public static TinyPredicate between ( String alias , String column , Object startValue , Object endValue ) { } public static TinyPredicate in ( String column , List values ) { } public static TinyPredicate in ( String alias , String column , List values ) { } public static TinyPredicate in ( String column , Object ... values ) { <START_BUG> return TinyPredicate . in ( column , values ) ; <END_BUG> } public static TinyPredicate in ( String alias , String column , Object ... values ) { } public static TinyPredicate and ( TinyPredicate ... predicates ) { } public static TinyPredicate or ( TinyPredicate ... predicates ) { } public static TinyPredicate not ( TinyPredicate predicate ) { } protected static boolean validateParameters ( TinyPredicate . Operator type , List values ) { } public String createExpression ( TinyQuery query ) { } public enum Operator { isNull , isNotNull , equal , notEqual , lessThan , lessThanOrEqual , greaterThan , greaterThanOrEqual , between , in , like ; } public boolean isSimple ( ) { } public String toString ( ) { } public static String likeParameterContains ( String parameter ) { } public static List listOf ( Object ... objects ) { } }

Fix:
return TinyPredicate . in ( null , column , values ) ;